A dust particle has a charge of 2.5mC and a mass of 0.0458 kg. The dust particle moves into an electric field generated by an old TV screen with a magnitude of 111.5 N/C. What is the acceleration of the dust particle?

Ahole in the ground in the shape of an inverted cone is 14 meters deep and has radius at the top of 11 meters. the cone is filled to the top with sawdust. the density of the sawdust depends upon the depth, x, following the formula ρ ( x ) = 2.5 + 1.2 e − 0.7 x kg/m3. find the total mass of sawdust in the conical hole.